-240 



The Mecroscope. 



writing and one vertical red line about one inch from left-hand side 

 of page. With a ruling-pen, draw a second simi- 

 lar red line about half an inch to right of first one. 

 This gives three spaces on each page. Now index 

 the edges, or right-hand margin of the pages, giv- 

 ing each letter its due proportion. In the first 

 space wi'ite the general name as "Amphipleura," 

 while in the third space you write the specific 

 name as "pellucida," together with the number 

 of the slide. The second space is for a key, or 

 catch-word, and for this purpose a set of abbrevia- 

 tions is used. In my book Di. — Al. F. — V. — His. 

 — M. — Tri. — signif}^ Diatoms — Fresh-Water Algae 

 — Marine Algae — General Vegetable — Animal His- 

 tology — Mineral — and Trichomes. Selecting any 

 letter of the index, a glance will instantly detect 



any diatom on the page, or indeed any other class of object sought. 



I have tried the "vowel " plan and others, but the above is superior. 

 It is convenient to keep also a plain numerical catalogue, on 



Ward's plan or simpler, as work or necessity requires. 



The cut of my label shows space for names and number. 

 Dixon, III. 



No 



Eugene Pinokney 

 Dixon, III. 



PROCEEDINGS OF SOCIETIES 



THE SAN FRANCISCO MICROSCOPICAL SOCIETY. 



^ I HE regular fortnightly meeting of this Society was held at its 

 -*- rooms May 25, 1887, President Wickson in the chair. 



Numerous additions were made to the library and files. Chas. 

 C. Riedy presented several books to the Society, among them being 

 Kolliker's "Microscopical Anatomy" and Peck's "Treatise on the 

 Achromatic Microscope." 



The Secretary reported that the diatomaceous earth recently 

 received from St. Helena had proved to be very rich, but was refrac- 

 tory and difiicult to clean. Various suggestions were made as to the 

 best methods of treating such deposits. 



J. Z. Davis exhibited a slide showing the net -work of spicules 

 in the beautiful " glass-rope sponge," Etiplectella speciosa. 



The remainder of the evening was devoted to perfecting 

 arrangements for the Society's Annual Reception, to be held at 

 Pioneer Hall on the 28th inst. 



