-° PROCEEDINGS OF TUE 



BiBLIOGKAPlIV: — 



Pulteney, Ridiurd. Progress of Botany, 1790. 



r.yte, 8ir 11. C. Maxuell. The Lvfes of Lytes Gary. (Proc. 



Somerset Arch, jiiid Nat. Hist. JSoc, 1892.) 



Geor-re, William. Lytes Gary Manor House, ^Somerset. Bristol, 

 11. d. ' 



Arber, Agnes, llerbals : Their Origin and Evolution. Cam- 

 bridge, 1912. 



Dounes, Harold. Henry Lyte of Lytes Gary. (Somerset and 

 Dorset ^Notes and Queries, 1917.) 



The President moved a vote of thanks to Mr. Downes for 

 presenting this interesting volume to th« Society's Library. 



Prof. J. Lloyd Williams, JD.Sc, then gave an account of the 

 i.ite-hi8tory of /Mnnnaria and Chorda, illustrated with about 40 

 lantern-slides. 



He remarked that un to a few years ago, Botany Students were 

 taught that the Laminariacea.-, though thev exhibit the highest 

 advance in their external morphology and internal structure, 

 pos.sessed no method of sexual reproduction, but propagated them- 

 selves by means of asexual zoospores; and consequently they had 

 to be classed, not with the higher, oogamous members of the 

 Phffiophycea}, but with the lower Ph^ozoosporea;. The recent 

 discovery of the development from germinating zoospores of two 

 kinds of gametophytes, producing respectively eg-s and anthero- 

 zoids, compels us to revise our ideas respecting the group and its 

 systematic position. 



The Author, after describing in det.-.il the structure of the 

 zoospore, its behaviour in germination, and the cvtoloo-v of the 

 processes, stated that cultures of Lamiuaria tliree ueeks'old, and 

 ot Uionla,Un'ee or four months old, almost invariably showed the 

 presence of two kinds of niulticellul.-.r germlings, on^ kind large- 

 celled, the other consisting of cells many times smaller. Sanva<reau, 

 by observing the development in his culture of abnormal sporangia 

 ot Saccorhtza, was able to prove that both kinds of germhngs were 

 produced from zoospores in the same sporangium. All attempts 

 at carrying the discovery further by ob>ervnig the actual liberation 

 of the sexual cells failed until two years ago, when the Author 

 witnessed the discharge of antherozoids and the process of fertili- 

 zation. Lantern-shdes were exhibited showing the Uxo gametic 

 nuclei within the eggs a little before fusion, and by comparison 

 with the appearance of the sporophyte rudiment immediately after 

 the farst division of its fusion nucleus it was shown that the one 

 condition can never be mistaken for the other. 



'i'he process of dehiscence of the oog(mium and the liberation of 

 the egg were explained in detail, and the difference between the 

 behaviour of the inner wall in Laminaria and Chorda explained. 



1 he Author had previously shown that Drew's supposed dis- 

 covery of the sexual nature of the " Zoospores" was incorrect but 



