958 General Notes. [September, 
tions, resulting from the action of the oil of cloves, followed by 
an increased action of the transmitted light on the sensitive col. 
lodion film of the negative, and hence by a thinner deposit of ink 
over corresponding parts of the positive plates from which the 
artotypes are printed. 
` With regard to the process employed, Dr. Mason says that 
after experimenting with various methods he found that satisfac- 
tory prints could be made in ink directly upon plate-paper, and 
that these impressions were as perfect in fine detail as any of those 
obtained by the silver process of printing. The plates (all printed 
y the artotype process), are as durable as steel-engravings. 
While a photograph cannot often show all that can be discovered 
by more direct microscopic observation with a judicious working 
of the fine adjustment, high authority has stated, and perhaps 
correctly, that a good photograph with a low power, say from 
three to one-half inch, is a better means of illustrating the ana- 
tomical structure of the nervous tissues than hand-drawing. Some 
of the plates with high powers leave much to be desired both in 
distinctness and tone, and in general it may be affirmed that the 
same defect as regards distinctness always exists, and for obvious 
reasons, in photographs of sections with powers much above one- 
half inch—/Jour, Roy. Mic. Soc., 1v, part I, pp. 149, 150. 
A Srarcu Injection Mass.—A coarse injection mass which 
is cold-flowing, may be forced nearly to the capillaries, rapidly 
hardens after injection, leaves the vessels flexible, does not dull 
dissecting instruments, is suitable for permanent dry or alcohout 
preparations, is simple in its manipulation, cleanly and economi 
cal, seems to be fully realized in the starch mass introduced by 
Ad. Pansch, of Kiel, and since recommended, with vanots 
modifications, by Wikszemski, Dalla Rossa, Meyer, and Brownt- 
ing, 
As starch is insoluble in alcohol and cold water, it ba 
hard when injected into the blood-vessels simply by the exu 
tion of the liquid with which it is mixed. (That the starch grat 
forming the mass remain entirely unchanged may be € uel 
onstrated by making a microscopic examination of the r 
of an injected vessel.) ‘tad of 
e mass originally recommended by Pansch consisted d 
wheat-flour and cold water, to which was added a sufficient 4 è 
tity of the desired coloring matter, Later experiments 1" 
shown that pure starch is better than flour. r 
? By Professor S. H. Gage. 
See Ad. Panch, “Archiv, für Anatomie und Entwickl.,”” 1877, PP- t 
and 1881, pp. 76-78; Wikszemski, same Journal, 1880, pp. 232434 83, PP 25r 
same, pp. 371-377; Herm. von Meyer, same, 1882, pp. 60, 61, and p ; 
; Browning, “ Annals of Anatomy and Surgery,” 1884, pp- 24 Ez 
