212 THE MICROSCOPE. 
The skinny or membranous tissues and fat cells take the blue 
stain, while the muscles, etc., take the red stain, the various parts 
appearing red, violet, blue and green of various shades. 
PALE COPAL VARNISH. 
Pale African copal, 1 part; fuse; then add hot, pale linseed-oil, 
2 parts. Boil the mixture until it is stringy, then cool a little, and 
add spirits of turpentine, 3 parts. 
AyotuerR Recerpr.——Dissolve 30 parts of pale copal and 2 parts 
of camphor in 120 parts of oil of turpentine and 30 parts of oil of 
lavender. 
A BLACK ELASTIC VARNISH. 
Burnt wmber. 205.5 eee... eee 120 parts. 
Senume asphalt 7h ccanee . . .:-:-) eee GOs 
iBoved “igiseed oil). Wer Sete... . Sees 3000 “ 
Dissolve the asphaltum in a small portion of the oil with the 
aid of heat; then add the umber, previously rubbed up with oil, and 
finally add the remaining oil. Mix the whole thoroughly, allow it 
to cool, and thin with oil of turpentine. This varnish is very 
elastic. 
ALUMINIUM PALMITATE COPAL VARNISH. 
Aluminium palmitate, a combination of aluminia and palmitic 
acid, is a resinous substance of remarkable properties, making it 
useful for many purposes in the arts. It melts at a higher temper- 
ature than damar and copal resins, and is easily soluble in oil of 
turpentine and benzine. A solution of one part of it in five of a 
solvent, retains a lacquer-like, thickly -fluid consistency. It never 
becomes brittle, but remains flexible and dries quickly. It has a 
silky gloss, bears an addition of any amount of damar and copal, 
obtaining thereby greater gloss, and depriving the latter two resins of 
their brittleness. It is entirely inodorous, and unaffected by water 
or dampness. It is recommended as a size for paper. This and 
pale copal, equal parts, or two-thirds copal, ought to make an 
excellent varnish for finishing slides. I have not yet tried it, but’ 
intend to. 
Any discussion of organic evolution must begin by assuming 
the existence of certain primordial forms of life. Whence came 
these forms? It can only be said that to this question science makes 
noanswer. We have no knowledge of any natural process by which 
living organisms are created. But this question really forms no 
part of the general question of organic evolution. It must be re- 
membered that evolution does not seek to explain the origination, 
but the formation of things,—~Stoller. 
