30 THE AMEJUCAN MO:NTnLY [February, 



here. Before he left his healtli had begun to fail, and after his return 

 late in the fall of 1890, he suffered still more. But his indomitable 

 perseverence led him to struggle on. He opened a place at No. 303 

 Dearborn street, in a very advantageous business portion of the city, 

 and began work again. It was not for long. After struggling with 

 disease for about six months he was compelled to stop forever. He 

 died Nov. v 1S91, at Elgin. 111., where he had gone for treatment by 

 Dr. P. Tyrrell. He leaves a wife but no children. 



Air. Bulloch wasa manofpronounced characterand indomitable energy 

 and perseverance. To those who did not know him well he appeared 

 brusque and sometimes even overbearing, but his numerous friends soon 

 learned to appreciate his straightforward manner of expressing his 

 views, his pertinacious but just demands for a proper recognition of his 

 rights, and his outspoken criticism of what he deemed erroneous in the 

 theories or opinions of others. In his business he was conscientious 

 and painstaking to a fault. Often when making an instrument or piece 

 of apparatus to order if he saw where there was room for improvement 

 he would spend hours or days in experiments, perhaps wasting the 

 results of all his previous labor, refusing to slight his work at any cost. 

 Whether it was the simplest accessory or the finest microscope stand, 

 nothing was allowed to leave his shop until it was as perfect as his 

 trained hands could make it. His reputation was more than money, 

 and he lived to see it world-wide. Besides being a member of the 

 Illinois vState Microscopical Society, he was a member of the Chicago 

 Academy of Sciences, the American Academy of Sciences, the Amer- 

 ican vSociety ot Microscopists, and of the Royal Microscopical Society 

 of London. His death leaves a gap in the rank of scientific workers 

 which can not easily be filled. 



Apparatus for Controlling: Living Organisms Under the Micro- 

 scope.* 



By E. A. SCHULTZE," 



NEW YORK, N. Y. 



Any one at all familiar with the microscopical study of living organ- 

 isms will have met with the difficulty of making a satisfactory exami- 

 nation on account of the globular shape of the liquid containing the 

 culture. It is well known that, in order to bring the objects to a full 

 state of development, the water, especially in the case of algaj, must 

 often be changed. In doing this it is in most cases difficult to prevent 

 the algie from changing their position under the cover-glass. Conse- 

 quently, a filament under observation mav be lost to view. Sometimes, 

 when a too sudden evaporation is feared, the volume of the drop must 

 be increased to such extent that the high-power objectives, and espe- 

 cially the homogeneous immersion lenses, can onlv be used on those 

 filaments which lie nearest to the cover-glass. 



The apparatus described obviates this difficulty, its construction ad- 

 mitting of a constant flow of water ; and it answers the purpose in every 

 particular. Two strips, of equal length and breadth, say, one inch long 



* Abstr.icted from an article by Dr. J. Von Klercker, Zeitschrj/t /uer Wissencha/lliche Mikfos- 

 Itopie, vol. II, page 145, and printed in the your mil 0/ the N. Y. Microscopical Society . 



