970 The American Naturalist. [November, 
I have pursued them, have no experimental virulence whatever in 
any of the usual small animals. The large bacillus (already- 
spoken of) which causes embolic hemorrhage in the kidney in 
some cases of Swine- Plague, also causes broncho-pneumonia in 
diseased swine, but is harmless otherwise. The specific disease 
supplies the field, or opens the way, for the action of these ad- 
ventitious germs through the disturbances of the circulation. 
That similar lesions may be due to microorganisms which also 
find their way into the circulation from the intestinal tract I have 
no doubt, though I am utterly without experience in that di- 
lis part of my story I will again repeat : 
s absolutely necessary to determine whether these deutero- 
ro-organisms are simply invasively-mechanical in their action, 
vhich of them also cause secondary infection. 
THE SILVER LAKE OF OREGON AND ITS 
REGION. 
TT took me three days and a quarter to ride to Silver Lake 
from Fort Klamath, by an indirect road. We came by 
Sprague river and Siacan Valley. The former runs into Wil- 
liamson's River and into Lake Klamath. 
Before I left Fort Klamath, the soldiers brought in a splendid 
lot of trout from these rivers, and I secured several in alcohol. 
They were the Salmo purpuratiis Pallas, and I have described 
their numerous variations in the Philadelphia Academy Proceed- 
ings for 1882. The largest weighed twelve pounds. 
Next day I started out with a four mule team and wagon with 
provisions. I rode a cavalry horse, " Jim," a heavily-built gray, 
with a good outfit of saddle-bags and straps. They gave me an 
old Klamath chief as a guide, from the Agency near by. This was 
