1910. ] Hydrochloric Acid in the Gastric Tubules. 93 
PLATE 9. 
Figs. 18-22 represent results obtained by action of silver nitrate on teased gastric 
glands of rabbit and guinea-pig. 
Fig. 
Fig. 
18.—Portion of the gastric gland of a rabbit exposed to the action of N/10 AgNO, 
for two days. The parietal cells are differentiated from the chief cells by their 
brown colour, but in this instance the brown reaction may be due to presence of 
phosphates, carbonates, or chlorides, or to all three of these “ reduced ” compounds 
of ilver. x 690. 
19.—Portion of teased gastric gland tubule from cesophageal region of normal 
rabbit, treated when fresh with N/10 AgNO,+1°5 per cent. HNO. Parietal cells 
are differentiated from chief cells by the intensity of their brown coloration. The 
reaction in this case is due to precipitation of “reduced” chloride of silver ; its 
occurrence in such marked degree demonstrates the presence of greater abundance 
of chlorides in these cells than in the chief cells. x 700. 
. 20.—Base of gastric tubule from cesophageal region of normal rabbit, treated when 
fresh with N/10 AgNO,+1°5 per cent. HNO,;. Excess of chlorides again 
demonstrated in parietal cells by their brown coloration. (See explanation of 
fig. 19.) x690. 
. 21.—Teased preparation of gastric gland tubules treated with N/10 AgNO,+1°5 per 
cent. HNO, Abundance of chlorides in parietal cells is demonstrated by their 
reddish-brown colour. 840. Guinea-pig. 
. 22.—Teased preparation of gastric gland tubule from fundus region of normal 
guinea-pig, treated with N/10 AgNO,+1°5 per cent. HNO,, showing presence of 
chlorides in deposit in lumen and in intercellular and intracellular channels. x 640. 
VOL. LXXXIII.—B. i 
