des Naturelistes de Moscow. 135 



the time of Pallas, had succeeded in discovering new objects of interest. 

 He set out in ] 832, and the above paper gives a slight sketch of his 

 proceedings, it being his intention to give a more ample account at some 

 future time. He refers chiefly to the plants observed in his route. In 

 the district of Isioum he describes the mountains as calcareous, contain- 

 ing fossil shells and belemnites, and they produce many plants entirely 

 foreign to the flora of Kharkov. Beyond them appear the plants be- 

 longing to the Steppes properly so called, viz. Dictamnus Fraxinella, Sta- 

 tice Gmelini, Glycyrrhiza glandulifera (Kit.) Artemisia procera, &c. At 

 Moskovskaia, in the government of the Caucasus, he observed on the 

 sides of hills inclining to the south, and even on their summits, Xeran- 

 themum Annettce, Polygala major, Pimpinella Tragium, Moso pimpinellifolia, 

 Vitis vinifera, &c. Near Jessuntouk, the ridges of the limestone moun- 

 tains are covered with Rhus cotinus, Aconitum Anthera, &c. The banks 

 of the impetuous river Podkoumok are fringed with Hippothoe rhamnoi- 

 des, Tamarix gallica and Palisii, Salices, &c. In a valley surrounded on 

 all sides by mountains, from which the Narzanza takes its rise, and 

 where there are thermal baths resorted to by invalids, the most conspi- 

 cuous and interesting plants are the following: Betonica grandiflora, 

 Polygala Sibirica (Linn.) Rhinanthus orientalis, (Linn.), Primula amoena, 



Dianthus fragrans, Azalia pontica, (Linn.), Trollius Caucasicus, fyc. 



Beschreibung einiger neuen in Liefland augefunden insecten, Von B. A. 

 Gimmerthal. Contains descriptions of several new dipterous and neu- 

 ropterous insects. 



Mutter's Archiv fur Anatomie, Physiologie, fyc. Parts iii. and iv. 



1836. 



Ueber de Metamorphosen des Eies der Fische u. s. w. Von M. Rusconi. 

 On the "changes which the Ova of Fishes undergo previous to the exclusion of 

 the Embryo. — In order to continue his observations on this subject, the 

 author repaired to the lake of Como early in July, being assured by the 

 fishermen that both Tench and Bleak deposit their spawn at that pe- 

 riod. On the 10th of that month he procured some eggs from a female 

 tench (Cyprinus tinea, Lin.), and placed them in a glazed earthenware 

 vessel filled with water from the lake. They immediately sunk to the 

 bottom, and two or three drops of milt were expressed from a male fish 

 upon them. The eggs were perfectly transparent, and of a greenish 

 yellow colour, like that of olive oil. The milt was of the colour of 

 milk, but much less fluid. In four hours after the fecundation, some of 

 the eggs seemed to have lost their transparency on one side, and others 

 by degrees assumed the same appearance, so that in twenty-four hours 

 they had all become opaque, and their vitality was considered to be 

 extinct. This the author supposed to have arisen from too large a 

 quantity having been laid one upon another in the vessel, and he ac- 



