on 
STRIPED MUSCLE OF WASP 
Il. MATERIAL AND METHODS 
In addition to the wing and leg muscles of the wasp, I used 
for comparative study similar material from fly, bee, and eyed 
elater (Alaus oculatus). These materials are practically identi- 
eal, except that the sarcostyle of the wasps’ wing muscle has a 
slightly smaller diameter than that of the elater, and a slightly 
greater diameter than that of the fly. The several technics of 
investigation included examination of fresh material in Ringer’s 
solution, in distilled water, and in a 2 per cent sodium-chlorid 
solution; examination in Toison’s solution, which proved ex- 
ceptionally satisfactory; examination of alcohol-fixed material 
in water, in glycerin, and in hypotonic salt solutions; Rollet’s 
gold-chlorid technic; fixation in 90 per cent alcohol, in strong 
Flemming’s fluid, and 10 per cent formalin, followed by iron- 
hematoxylin staining with and without eosin and Van Gieson’s 
counterstain. 
III. NOMENCLATURE 
The present lack of uniformity in the terminology employed 
for the description of striped muscle structure is confusing and 
adds an extra element of difficulty to an inherently complex 
subject. The time seems ripe for insistence upon a uniform, 
meaningful, and precise terminology. In an effort to select 
from the profusion of proposed terms the most satisfactory 
designations, I shall be guided by two principles: 1) The omis- 
sion of proper names; 2) preference for the term which expresses 
most regarding structure and essential relations. To these I 
shall add in brackets the more widely used synonyms, advo- 
cating their early discardure. 
Sarcostyle would seem to be an acceptable designation for the 
unit of muscle structure, and, from the viewpoint of comparative 
histogenesis, preferable to its synonym myofibril. The protop- 
plasmic substance of the sarcostyle may be designated sarco- 
plasm. Within the sarcostyle may under certain conditions be 
discerned constituent still smaller fibrils. Regardless of the ques- 
tion whether these subdivision are artificial separation products 
