1 882.] On Certain Aboriginal Implements, etc. 203 



cient to observe what cannot be seen in regard to the very minute 

 swine-plague Schizophytes. Therefore, a little more than what 

 is really known about the latter may almost safely be inferred 

 from analogy. But I will not enter into speculations, and, at any 

 rate, first state what I have seen. Sometimes in perfectly fresh 

 blood serum and in fresh lung-exudation, and almost always in 

 blood serum and lung-exudation 12 to 24 hours old, and also in 

 the mucus and morbid products of a diseased piece of intestine, 

 peculiar-shaped Schizophytes can be found. The same are rod- 

 shaped, but have at one end, or sometimes towards the middle, a 

 very bright granule, which strongly refracts the light, and conse- 

 quently is more dense than the rest of the bacterium. It is of 

 about the same diameter as the rod itself. This granule is sur- 

 rounded or enveloped by a zone or ring — possibly a membrane — 

 which is less dense, and much less light-refracting. The whole 

 rod, therefore, if this granule is situated at one end, as is usually 

 the case, presents the shape of a club, or rather that of a short 

 stick with a bright round knob at one end. It is a so-called 

 Helobacterium (Billroth), and the bright and dense or light- 

 refracting granule is a so-called lasting spore (Dauerspore of Bill- 

 roth). 



(To be continued.) 



ON CERTAIN ABORIGINAL IMPLEMENTS FROM 

 NAPA COUNTY, CALIFORNIA. 1 



THE figures herewith presented illustrate a collection made by 

 A me in October, 1881, on the top of Howell mountain, in 

 Napa county. 



The mortars are exteriorly rude unworked stones, generally of 

 much harder quality than most of the country rock in the neigh- 

 borhood. Fig. 1 is the most symmetrical of the five specimens 

 collected ; in this respect it is the least characteristic ; otherwise 

 so far as diameter and depth of the concavity are considered, it is 

 a fair type of all. 



I was unable to find a single specimen, or even a fragment, 



'Read before the California Academy of Sciences, October 19, 1SS1. 



