Plants. 549 



reason why there is no powder (seeds) underneath is, I presume, 

 because in its natural state that part isjixed to the tree, and con- 

 sequently no seeds can issue from it there. The powder begins to 

 be visible about seven o'clock in the evening. The follow- 

 ing names all belong to this one species : — Peripherostoma 

 concentricum, Gray's Nat. Arr., p. 513. ; Stromatosphag v ria 

 concentrica, Greville's Flor. Edin., p. 355.; Hypoxylon concen- 

 tricum, Greville's Cryp. Flor., tab. 324. ; Sphae'ria concentrica, 

 Greville's Synopsis, p. 24. ; Stromatosphae'ria concentrica, En- 

 cyclopaedia of Plants, No. 16360. ; Sphae v ria concentrica, Ency- 

 clopedia of Plants, No. 1 6425. Are these two last the same 

 plant? [They are.] lam, Sir, yours, &c. — Daniel Stock. 

 Bungay, July 12. 1832. 



P. S. — Since the above was written, I find that it is not only 

 of a night that the seeds are emitted ; for during the whole of 

 yesterday (Wednesday) the seeds were issuing from the 

 plants; at noon were distinctly visible; and this morning 

 (Thursday), the quantity of powder (seeds) is considerably 

 larger, and extends to a greater distance (two inches) from 

 the plants. — D. S. 



The best Way to obtain a View of the Circulation of the Sap 

 in Chdra vidgdris (Vol. V. p. 349.) is as follows: — Rub a 

 piece of the plant gently with a wet bit of leather, which will 

 rub off some of the incrustation of dirt and lime with which 

 this plant is usually invested, and which renders it opaque 

 and injures it very much as a microscopic object : the rubbing 

 will render it sufficiently transparent. A piece of the plant 

 about a half or three quarters of an inch long should then be 

 put between two pieces of glass, with a little water, but with- 

 out being pressed so as to bruise the plant. I think a high 

 power is best, as no light is then seen but what comes through 

 the stem of the plant. If the plant is pretty free from dirt, the 

 sap will be seen ascending along the middle of the stem, and 

 descending at the side. It has much the same appearance as 

 the circulation of the blood, but the globules are much fewer 

 in number, and larger. It may be found rather difficult, at 

 first, to obtain a good view of it, but it well repays the trouble 

 attending it. See Vol. V. p. 349. of this Magazine for a fur- 

 ther account of it. 



I would here just observe that I do not know of any 



Animal which shows the Circulation of the Blood so well as a 

 very young newt. It is best seen in its tail, which is much 

 more transparent than that of the tadpole, and it has a much 

 greater number of veins and arteries in the same space, which 

 much increases the beauty of the spectacle. — E. T. S. Sept. 7. 

 1833. 



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