THE BOTANISTS OP PHILADELPHIA. 333 



before three years had passed its discouraged young pro- 

 prietor had sold out. 



With the feeHng that, after all, business was not to be 

 his life occupation, his attention now began to be turned 

 toward the teacher's profession. After giving instruction 

 in common school branches for a year or more, he was 

 offered by Chancellor Burroughs, for whom he entertained 

 a strong affection, the position of Registrar of his Alma 

 Mater, the University of Chicago. This was gladly accepted 

 in the hope that it would afford him the coveted opportuni- 

 ties for pursuing his scientific studies, the taste for which 

 had been rendered keener still by perusal of the works of 

 Darwin, Wallace, Huxley and Tyndall. This was in the 

 year 1874. It happened not long afterwards that the Uni- 

 versity wanted a teacher for a class in botany, and as the 

 young registrar's interest in the subject was now Avell 

 known to the trustees, he was asked to take charge of the 

 class, which he did with such success, that in two years he 

 was elected to the chair of geology and botany. This 

 position he held until 1883, wdien, owing to differences 

 between the President of the University and himself on the 

 doctrine of evolution, he resigned. 



Some years previous to this event, however, he had 

 been giving lectures on botany in the Chicago College of 

 Pharmacy, and, as this institution developed rapidly, 

 he undertook the additional work of instruction in materia 

 medica and devoted now his entire time to the development 

 of these departments. One of the results of his work was 

 the establishment of a botanical laboratory, the first of its 

 kind connected with an independent College of Pharmacy 

 in this country. 



