420 TRANSACTIONS OF THE CANADIAN INSTITUTE. [Vou. VIII. 
N 
Fig. 19.—Muscle, Lachnosterna fusca. — AgNO,+1.5 per cent. HNO,, 48 hours 
x 1000. 10 
N 
Fig. 20.—Wing Muscle of Calosoma Scrutator, — AgNO,+1.5 per cent. HNO,, 5 
days x 1000. ue 
N 
Fig. 21.—Wing Muscle, Wasp. — AgNO,+1.5 per cent. HNO,, 5 days x 1000. 
To 
N 
Fig. 22.—Wing Muscle, Wasp. — AgNO,+1.5 per cent. HNO,, 18 hours, shew- 
10 
ing the distribution of the chlorides at the extreme edge of the dim band, and at the 
border of the light band x tooo. 
Figs. 23-31.—Preparations treated with cobalt solution, Co Na, (NO,),, and am- 
monium sulphide. 
Fig. 23.—Wing Muscle, Texebrio molttor. Cobalt solution 67 parts + 50 per cent. 
sodium nitrate solution, 33 parts, 5 minutes x 1000. 
Fig. 24.— Wing Muscle, Calosoma Scrutator. Cobalt solution 50 parts + 50 per cent. 
sodium nitrite solution 50 parts, 2 hours, shewing an aggregation of potassium at the 
border of the dim band, and along Hensen’s line x 1000. 
Fig. 25.—Wing Muscle, Zexebrio Obscurus. Cobalt solution 67 parts + 50 per cent. 
solution of sodium nitrite, 33 parts, 5 minutes. The light band in this preparation is so 
narrowed as to be practically indistinguishable except when the fibres break at this 
point x 1000. 
Fig, 26.—Wing Muscle, Aeschna. Cobalt solution 50 parts + 50 per cent. sodium 
nitrite, 50 parts, 2 hours. Central zone of the dim band free from potassium holding 
material. Light band also shews no reaction x 1000. 
Fig. 27.—Muscle Fibre, Calosoma Scrutator. Cobalt solution 50 parts + 50 per 
cent. sodium nitrite, 50 parts, 2 hours x tooo. Central third of dim band free from 
potassium. 
Fig 28.—Wing Muscle, Zenxebrio molitor, Cobalt]}solution, 50 parts + 50 per cent. — 
sodium nitrite, 50 parts, 5 minutes. Shewing the localization of potassium at the junc- 
J 
tions of the light and dim bands x rooo. 
Fig. 29.—Wing Muscle, Zexebrio molitor. Cobalt sclution, 15 hours. Reaction ob- 
taining only on the borders of the light band x 1000. 
Fig. 30.—Wing Muscle, Zezebrio. Cobalt solution, 15 hours. The distribution of 
the potassium wholly in the light band x t1ooo. 
Fig. 31.—Wing Muscle, Zenebrio. Cobalt solution 50 parts + 50 per cent. solution 
of sodium nitrite, 50 parts, 5 minutes. Shewing a fibre as a wave of contraction is 
passing over it x 400. 
us 
Figs. 32-38.—Preparations treated with — AgNO, . 
10 
