130 KAARE MÜNSTER STRØM. 



The poverty of algæ, especially desmids, may be due to the 

 unsystematic method of collection, (Professor Wille could only 

 occasionally collect algae), but I think that the districts are really 

 poor, that depending largely upon the geologic formations and 

 the relative dry climate. 



I regret very much that nothing can be said about the geo- 

 graphic affinities of the Caucasian algae, as the material was 

 too poor. 



The follovving determinations are carried out under the charge 

 of professor dr. N. Wille. 



List of the samples: 

 The samples were preserved by acetate of potassium and 

 by drying. (All the altitudes are in feet.) 

 Fjatigorsk. (from sulphur springs and also from freshwater) 



14 dried samples. 

 Kislowodsk. One sample preserved by acetate of potassium. 

 Wladikaokas — Kasbek. (2300 — 7500) 16 dried samples, and 



12 preserved by acetate of potassium. 

 Kasbek— Mleti. (7500—4500) 14 dried samples, 8 preserved by 



acetate of potassium. 

 Mleti — Douchet. (4500—2700) 3 preserved by acetate of potas- 

 sium. 

 Douchet — Tiflis. (2700 — 1500) One sample preserved by acetate 



of potassium. 

 Tiflis. (Especially from the brook near the botanic garden) 



24 dried samples. 

 Mtskhéi. One dried sample. 

 Elborus and environs. (Summit of Elborus 18000). (Messrs. Hack- 



mann; dr. Fraser Hume; dr. Andreæ leg.) 7 dried samples. 

 Sulphur Algæ from the Zei valley. (Professor Gunnar Andersson 



leg.) One dried sample. 

 Askabad in Turkestan. 8 dried samples, 16 preserved by acetate 



of potassium. 



