370 Mhcellun ies. 



9thj Digitalis purpurea. — Htb, White and orange lily. — 18th, Ca- 

 talpa tree. — lOth, Red cherry ripe. — 21st, Raspberry ripe. — 22d, 

 Early cucumbers fit for table. — ^26th, The water in a well sixty feet 

 deep is at the temperature of 55^, open air 78^. — 30th, Asclepias 

 tuberosa in bloom. 



July 1st, Wheat harvest commenced.— 3d, Sambucus and Dat. 

 stram, in bloom. — 7th, Early apples beginning to ripen. — lOth, 

 White rosebay and purple althea. — 13th, Asclepias syriaca. — 17th, 

 Acacia marylandica. — 19th, Genista americana and purple flox. 

 20th, Ribes villosa ripe. — 22d, Sugar pear ripe. — 26th, Watern^ 

 Ions ripe. 



8. Wire gauze windows^ a suggested protection against the effects 

 of malaria and aerial poisons ^ by Roht, Cannon Bond^ M. D. 

 However much medical men may differ as to the origin and nature of 

 malaria^ all agree that it is inseparable from moisture. Such is the 

 opinion of Prof. Chapman, as recently expressed in his very valuable 

 treatise on epidemics; and a late writer, Dr. Ferguson of the British 

 army, asserts, that however distinct they may be, "they are always 

 found in company." Wherever vapors are most copiously produced, 

 there miasmata are generated. When vapor Is most abundant, as in 

 the morning and evening, in the form of dew and fog, then malaria is 

 most active- Is vapor dissipated by the sun and heat? so is malaria. 

 Both are wafted by the winds, absorbed by water, and arrested by 

 frost. Malaria is known to be intercepted by groves and walls, the 

 moisture in the air being condensed. From these facts it has occur- 

 red to me, that wire gauze, similar to that of which Sir Humphry 

 Davy's safety lamp is constructed, placed up at the windows at night, 

 may answer a very useful purpose by condensing the moisture, and 

 thus arresting the source of miasmatic diseases. It Is now a settled 

 law in meteorology, that vapor is most raj^idly and copiously conden- 

 sed on those substances which are good conductors; — more abun- 

 dantly upon glass and metals than cloth, or the surface of tlie earth. 

 1 have little doubt that windows of this kind, by leaving at all times a free 

 circulation of air, may be very usefully applied to hospitals, and crow- 

 ded rooms for die sick, and to jails and manufactories, and thus afford 

 a safe guard from disease. To keep the rooms of the sick well ven- 

 tilated, and at the same time exclude the dampness of the air, has long 

 been a desideratum among physicians. And even persons in health, 

 during the hot and sultry nights of autumn are much incorfimoded by 



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