PSEUDO-ORGANIC STRUCTURES OF COLLOIDAL 
SILICATES. 
* A. L. HERRERA, 
Chief of the Commission of Parasitology, Mexico. 
(AFTER MICRO PHOTOGRAPHS.) 
1. Silicate of sodium and ether. Z and 4. The same. 3. Silicate of 
sodium and aluminium sulphate. 5 and 6. Silicate and alcohol. 
7. Silicate of sodium and sulphate of aluminium 
Potass. 8. Silicate and salt. 
While analyzing the reagents which are generally used for the imita- 
tion of the protoplasma (as phosphates, tannates, oleates, ferrocyanides), 
I have found traces of silicates, and I have continued the study begun 
by Moniez and Vogt. The results are quite noteworthy; but I shall 
limit myself to the summary thereof after stating that photographs have 
been taken of most of the structures and that I remit herewith several 
direct microphotographs. I have operated with strongly antiseptic 
liquids , 1 containing an excess of alkali, whereon never appeared any 
mould, bacteria, or any incidental organism. 
The silicate of sodium, or potassium, was treated with the following 
x The sirupy silicate of sodium and potassium always contain a large surplus 
of alkali. 
