It was at this time that, through the efforts of Miss Lucretia Crocker, the study of zoölogy was introduced into the high schools of Boston, and the study of Nature in the public schools took a definite form. At this time The Teachers' School of Science attained an extraordinary size and importance, a development which was sudden and unexpected. The supervisor of Nature study, Miss Crocker, assured the directors of the school that their assistance would be of great benefit, and in fact essential, to the success of the introduction of this subject into the schools. It was therefore determined to institute appropriate courses upon elementary botany, zoölogy, and mineralogy, if the means of paying the expenses could be raised. Mrs. S. T. Hooper and Miss Crocker undertook a considerable amount of the necessary work, and fortunately their scheme met with substantial appreciation from Mrs. Augustus Hemmenway, who subscribed most liberally, and they were assured of further support and interest. Obstacles arose on account of the number of applicants and the necessity of providing identical specimens for all. The association and sympathy of Mrs. Elizabeth Agassiz with the undertaking was particularly gratifying, since Prof. Louis Agassiz was the first naturalist who ever taught the popular audiences in this country with the specimens in hand. Large sums of money were contributed by women, many members of the Natural History Society, and the teachers themselves joined in making up the necessary fund. The Institute of Technology generously gave the use of Huntington Hall upon the payment of a nominal sum for cleaning and heating. Count Pourtalés, Dr. Hermann Hagan, and Mr. E. C. Hamlin, of the Museum of Comparative Zoölogy, which was under the direction of Mr. Alexander Agassiz, at various times assisted by donations from their respective departments. Further assistance in various ways, such as the drawing of zoölogical charts, preparations of models, and donations of specimens, was received from other persons. There were six hundred and sixteen applicants for this winter's course, and the number of specimens distributed did not fall short of one hundred thousand. After an introductory lecture, at which the Superintendent of Public Schools, the President of the Society of Natural History, and the custodian, delivered addresses appropriate to the occasion, Professor Goodale completed a course of six lessons on botany, in which he instructed the whole audience of five hundred. These lessons were followed the same year by twelve on zoölogy by Professor Hyatt, and five on mineralogy by Mr. Burbank, which ended with a geological excursion to Marblehead. These lessons were given to very large classes, and were supplemented by the issuing of pamphlets under the general title of Science Guides. Three numbers--About Pebbles, by Professor Hyatt; A Few Common Plants, by Dr. Goodale; and Commercial and Other Sponges,