ZOOLOGY AND BOTANY, MICEOSCOPY, ETC, 763 



to speak of tliis obscure and abnormal parasite by the name he 

 originally suggested of Globidium leucharti. 



Sutherlandshire " Eozoon."* — Prof. M. F. Heddle, after a careful 

 examination of the Eozoon-like structure that occurs in the marbles of 

 Assynt, recalls his previously expressed opinion as to its non-mineral 

 character and attributes to it a purely inorganic origin. The greater 

 part of this structure is formed of dark serpentine with some mag- 

 netite, whilst in the calcareous layers are imbedded fibres apparently 

 of wollastonite. Prof. Heddle states in a footnote that having un- 

 ravelled the Scottish Eozoon, he entered upon an inquiry into the 

 Canadian, in which he finds nothing he did not see in the Scotch 

 specimens ; at the same time the specimens examined were possibly 

 not good examples. 



BOTANY. 



A. GENERAL, including Embryology and Histology of the 

 Phanerogamia. 



Continuity of Protoplasm.t— P. Terletzki has investigated this 

 question with a view of determining what organs and what tissues in 

 the same plant display the phenomenon. For this purpose he has 

 taken in the first place Pteris aquilina, and has found a distinct 

 protoplasmic connection, in the rhizome, between the parenchymatous 

 cells, the conducting cells, and the sieve-cells, in each case among 

 one another, and between the sieve-cells and the conducting cells. 

 On the other hand, he could detect no connection in the following 

 cases : — between the cortical cells among one another, between the 

 cortical and parenchymatous cells, the cells of the supporting bundles 

 among one another, the supporting bundles and the parenchyma, the 

 cells of the protecting sheath among one another, the protecting 

 sheath and the parenchyma, the protecting sheath and the conducting 

 cells, the bast-cells among one another, the bast-cells and the con- 

 ducting cells, the bast-cells and the sieve-cells, the conducting cells 

 and the scalariform vessels, the conducting cells and the tracheids 

 (annular or spiral conducting cells). These remarks apply to the 

 mature condition of the plant, and it is possible that in the cambial 

 condition the protoplasm of the whole of the cells may be in 

 connection. 



The general facts were the same in other organs of P. aquilina^ 

 and in other ferns. 



Protoplasm was found in the intercellular spaces, especially in 

 the parenchyma of the rhizome, also in the parenchyma of the leaf- 

 stalk ; and this intercellular protoplasm was in connection with the 

 cellular protoplasm. 



♦ Mineral. Mag., v. (1884) pp. 271-324 (11 figs.), 

 t lier. Deut.sch. Bot. Geeell,, ii. (1884) pp. lG'J-71. 



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