344 The Microscope. 



walls (Fig. 5). This pouch passes forwards and ends in a long pro- 

 toplasmic cord or ovary ( ?) which bends and passes over the intes- 

 tine. The broad pouch often contains embryos in various stages of 

 development, the youngest being at the extreme end, and the older 

 ones nearer the generative opening. Some of the youngest may be 

 seen invested in a delicate shell, undergoing segmentation. 



When the eel has finished its early stages of development inside 

 the mother, it escapes by a wriggling motion from the generative 

 passage (Fig. 4), and shortly after becomes very lively. — Science 

 Gossip. 



Colors of Fresh Water Alg^. — The colors of our fresh water 

 algse, says Edward S. Burges, in the American Naturalist, are varied 

 to a degree that may surprise the student who expects only green. 

 There is considerable variety, even in their green, from the grass-green 

 of the spirogyras to the pea-green of some palmellas, the little "water- 

 flower," so to render its name, Anabcena flos-aquce, is a verdigris- 

 green; Chlamydonionas hyalina is called by Wolle a milky-green. 

 Many shades of red are found, vermilion in Chlamydocoecus, scarlet 

 in Thorea, blood-red in Glceocapsa sanguinea, amethystine in Lepto- 

 thrix tinctoria. Hildebrantia is often purple, one of the Chan- 

 transias is rose-purple, Lemanea is violet; species of Chroolepus 

 range through ash, yellow and orange to golden red; Tuomeya is 

 said to be olive-colored; Hydriurus ochre; some Vaucherias are brown, 

 one Glseocapsa is black, a Leptothrix is straw-colored, another fawn, 

 a Chantransia steel-blue, a Cylindrocapsa pearly. Many preserve 

 their colors when dried, others change, some simply by fading to a 

 lighter shade of their previous color, others to a new tint. One Batra- 

 chosperus is described as at first of a mouse- gray color, then yellow, 

 and on drying, violet; Chantransia macrospora and Thorea are, 

 when living, dark green, but dry a beautiful purple- violet; the Sweet 

 Chroolepus is tawny when fresh, changes to an ashen-gray and finally 

 greenish ; a kindred species is reddish- orange, then olive, and 

 light yellow on drying; Zygnema purpureum changes from purplish 

 green to dark purple. Lyngbya tinctoria, says Wolle, from purple 

 to violet steel; Vaucheria dichotoma may stand as a type of the 

 change so frequent in the higher plants, from green to brown. Many 

 algse unite several colors at the same time, almost all do so when we 

 compare the spores with the vegetative growth. A remarkable 

 instance of variegation in vegetable growth alone is seen in a new 

 Lyngbya found by Wolle in the Lehigh at Bethlehem, Penn., waving 

 in tufts six inches long, " the extremities bright blue-green, lower 



