Botany and geology have been favorite studies of the author since leaving college, thanks to Dr. Nelson, who lives in the hearts of all his students. He, by his teachings, made these subjects so attractive and interesting that by one, at least, every spare moment has been given to following up the studies of botany and paleontology. But the mycological part of botany was brought practically to the author's attention by the Bohemian children at Salem, Ohio, at the same time arousing a desire to know the scientific side of the subject and thus to be able to help the many who were seeking a personal knowledge of these interesting plants.

Every teacher should be able to open the doors of Nature to his pupils that they may see her varied handiwork, and, as far as possible, assist in removing the mist from their eyes that they may see clearly the beauties of meadow, wood or hillside.

In beginning the fuller study of the subject the writer labored at great disadvantage because, for a number of years, there was but little available literature. Every book written upon this subject, in this country, was purchased as soon as it came out and all have been very helpful.

The study has been a very great pleasure, and some very delightful friendships have been made while in search for as great a variety of species as possible.

For a number of years the object was simply to become familiar with the different genera and species, and no photographs of specimens were made. This was a great mistake; for, after it was determined to bring out this work, it seemed impossible to find many of the plants which the author had previously found in other parts of the state.

However, this failure has been very largely overcome through the generous courtesy of his esteemed friends,—Mr. C. G. Lloyd, of Cincinnati; Dr. Fisher, of Detroit; Prof. Beardslee, of Ashville, N. C.; Prof. B. O. Longyear, of Ft. Collins, Col., and Dr. Kellerman, of Ohio State University,—who have most kindly furnished photographs representing those species found earlier in other parts of the state. The species represented here have all been found in this state within the past few years.

The writer is under great obligation to Prof. Atkinson, of Cornell University, for his very great assistance and encouragement in the study of mycology. His patience in examining and determining plants sent him is more fully appreciated than can be expressed here. Dr. William Herbst, Trexlertown, Pa., has helped to solve many difficult problems; so also have Mr. Lloyd, Prof. Morgan, Capt. McIlvaine and Dr. Charles H. Peck, State Botanist of New York.

The aim of the book has been to describe the species, as far as possible, in terms that will be readily understood by the general reader; and it is hoped that the larger number of illustrations will make the book helpful to those who are anxious to become acquainted with a part of botany so little studied in our schools and colleges.

No pains have been spared to get as representative specimens as it was possible to find. A careful study of the illustrations of the plants will, in most cases, very greatly assist the student in determining the classification of the plant when found; but the illustration should not be wholly relied upon, especially in the study of Boleti. The description should be carefully studied to see if it tallies with the characteristics of the plant in hand.

In many plants where notes had not been taken or had been lost, the descriptions given by the parties naming the plants were used. This is notably so of many of the Boleti. The author felt that Dr. Peck's descriptions would be more accurate and complete, hence they were used, giving him credit.

Care has been taken to give the translation of names and to show why the plant was so called. It is always a wonder to the uninitiated how the Latin name is remembered, but when students see that the name includes some prominent characteristic of the plant and thus discover its applicability, its recollection becomes comparatively easy.

The habitat and time of growth of each plant is given, also its edibility. The author was urged by his many friends throughout the state, while in institute work and frequently talking upon this subject, to give them a book that would assist them in becoming familiar with the common mushrooms of their vicinity. The request has been complied with.

It is hoped that the work will be as helpful as it has been pleasant to perform.

M. E. H.

Chillicothe, Ohio, January 11, 1908.