1894.] Anatomical and Physiological Researches. 407 
We know that a number of non-phosphorescent bodies emit 
rays of light after having been under the influence of the lat- 
ter. The duration of this condition is from a few minutes 
to.twenty-four hours. Metals like steel and iron are non- 
phosphorescent, but we have here a new form of this phe- 
fomenon, dark phosphorescence. It is the light, and not the 
heat which produces the effect named upon the metals; the ts 
color of the rays does not seem to have any power to produce : 
in the metals the effect described above. Zinc becomes ac- 
tive by heating alone; when experimenting with this body, 
Elfving found that it acts as a positive thermotropic agent. | 
On Copper, cobalt, nickel, tin, lead, and glass, heating (as ie 
above) alone did not produce the activity, although these ; 
metals and the glass were heated until they were nearly melt- 
8, and then allowed to cool so far that the hand could not 
feel the heat. 
*rpern selbst innewohnen, oder irgend eine in denselben : 
Stattfindende Veriinderung begleiten, ahnliche physiologische = 
Wirkungen hervorrufen kénnen. Was speciell die Metalle ar. 
betrifft, zeigt uns ja auch die Metallotherapie Wirkungen, die ee 
“atschieden fiit solche sprechen.”—J. CHRISTIAN Bay. ee 
# Color bodies in seeds and seedlings.’ 
ti mt this paper Famintzin gives the results of his investiga- 
aon te origin of chlorophyll in plants, a subject con— 
Ditric which there is much uncertainty and difference of 
* ae aS may be seen in the fact that Bredow and Belzung 
“lat this question came to diametrically opposite con- 
Famintzin’s attention was directed principally to the ripe 
ae = Helianthus. Microtome sections were placed in ph 
thus oil, Whereby colorless choromatophores, 1.5-2-54 
a diamet 
altho €t, were distinguished without further ghia os : 
sect ugh their Presence was more easily discernible when The Oe 
chroma, had been slightly moistened with the breath. Sn she ; 
de tophores are situated partly in the spaces betwee mnt 
va, Stains and partly on the surface of the latter ané 
"Pn the cel] nucleus. ; i 
- : aes 
7” esas A. Ueber das Schicksal der Chlorophylikorner in ens der 
Akadamie ,'0,PP-» 1 plate. Arbeiten des botanischen Centralbl. 58: 378-9: 
Hig St. Petersburg, 1893. No. 5. Abst. in Botan. © sce. 
