Meteorological Observations. 151 



jected, that it would be unadvisable to increase the number of fami- 

 lies by forming one containing only one or two species. 



The Isoetes are certainly not ferns, neither can they be classed 

 with the Lycopodiacea, as some have proposed. In the flora resulting 

 from the botanical explorations of the scientific commission of Al- 

 geria, the family of the Isoctacece has not only been firmly established, 

 but at least two or three species have been added. 



In the first instance only two Isoetes were known, both aquatic ; 

 the lacustris of the north, and /. Coromandelia of Hindostan. Prof. 

 Delile found the Isoetes of the pool of Gramont near Montpellier so 

 different from the lacustris of Linnaeus, that he has characterized it as 

 a new species under the name of /. setacea. It is essentially south- 

 ern, and has been found by Dr. Mogent in the Geradmer, an elevated 

 lake of the Vosges. Subsequently a fourth Isoetes was found in Brazil, 

 and several others have been found in N. America, New Holland and 

 the islands of the Pacific. Those which have been found in Algeria 

 are of two kinds, and might be separated into two very distinct sub- 

 genera : the first composed of two or three species, like all previously 

 known Isoetes, aquatic ; the second of two terrestrial species, which 

 instead of growing at the bottom of lakes, are found in the driest and 



most exposed parts of the country. The Isoetes of Algeria are 



*Aquaticse : 1. J. setacea, Del., a Delilei, /S Peyrremondii ; 2. /. Ion- 

 gissima (n. sp.) : ** Terrestres : S.I. Duriei(n. sp.), and 4. /. hystrix 

 (n. sp.). — Comptes Rendus, June 24, 1844. 



METEOROLOGICAL OBSERVATIONS FOR JUNE 1844. 

 Chiswick. — June 1. Clear and fine. 2. Overcast and cold : fine: cloudy. 3. 

 Light clouds and very fine. 4, 5. Very fine. 6. Slight rain: cloudy. 7. Over- 

 cast : hoisterous. 8. Very fine. 9. Slight rain: very fine. 10. Fine: cloudy. 

 11 — 16'. Very fine. 17. Hot and dry • cloudy. 18. liain : fine. 19. Overcast: 

 heavy clouds, with showers. 20. Overcast. 21, 22. Very fine. 23. Exceed- 

 ingly clear : sultry. 24. Cloudy: hot and sultry. 25 Constant heavy rain. 

 26. Cloudy: fine. 27. Cloudy. 28, 29. Very fine. 30. Dry haze : overcast and 

 fine. — Mean temperature of the month 2 0, 19 above the average. 



Boston. — June I. Fine. 2, 3. Cloudy. 4. Fine. 5. Cloudy. 6. Rain 

 early a.m.: rain a.m. 7. Cloudy. 8. Cloudy: thermometer at 4 o'clock 75°. 

 9. Cloudy. 10. Fine : rain a.m. 11. Fine. 12. Fine : thermometer 4 o'clock 

 75°. 1:3. Fine : stormy all day. 14,15. Stormy. 16,17. Fine. 18. Cloudy. 

 19,20. Cloudy : rain a.m. and p.m. 21. Cloudy. 22. Fine. 23. Fine : ther- 

 mometer at noon 81°. 24. Fine: rain early a.m., with thunder and lightning: 

 thermometer at noon 80°. 25. Cloudy: rain a.m. and p.m. 26,27. Cloudy. 

 28-30. Fine. 



Sandtvick Manse, Orkney. — June I. Cloudy. 2, 3. Bright: cloudy. 4. Showers: 

 cloudy. 5 — 7. Showers: rain. 8. Bright : cloudy. 9. Cloudy : showers. 10, 

 11. Bright : drops. 12. Bright : rain. 13. Showers : bright. 14,15. Showers. 

 16. Bright: clear. 17. Clear. 18. Drizzle. 19. Drizzle: drops. 20. Showers: 

 drops. 21. Clear. 22. Fog. 23. Drops: clear. 24. Hazy: clear. 25. Clear: 

 cloudy. 26, 27. Cloudy. 28. Cloudy : damp. 29, 30. Cloudy. 



Apptegarlk Manse, J )u m fries -shire.— June I. Dry and withering. 2. Dry and 

 withering: cloudy. 3. Fine. 4. Cloudy and threatening ram. 5 t 6. Rain. 

 7. Very wet. 8. Fair, but cloudy. 9. Fair: threatening. 10. Showers. 11. 

 One slight shower. 12, 13. Heavy rain. 14, 15. Fair. 16. Fair and fine. 

 17,18. Rain. 19. Fair. 20, 21. Rain. 22. Fair. 23. Fair and warm: 

 thunder. 24. Rain. 9.5. Showery. 26 — 30. Fair and fine. 



Mean temperature of the month 55°-l 



Mean temperature of June 1843 54 >7 



Mean temperature of spring-water 51 *6 



Mean temperature of ditto June 1843 50 -7 



