The theory and practice of hygiene (Notter and Firth) / by J. Lane Notter ... and W. H. Horrocks.
- James Lane-Notter
- Date:
- 1900
Licence: In copyright
Credit: The theory and practice of hygiene (Notter and Firth) / by J. Lane Notter ... and W. H. Horrocks. Source: Wellcome Collection.
Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.
112/1146 page 90
![gone so far as to say that they would rather know nothing abont the .ann>le Ld merely wish it marked with some distinctive mark, buc^i as A or i> or 1 or 2, their confidence being so great in the indications °f ^ f^^f that they feel convinced they can give a perfectly trustworthy ^^^ the whoLomeness or otherwise from these alone. There i ^« ^o^iM^^^^^^^ a practised chemist may make a fairly good ™^ur but as a rule an opinion so formed is worth very little. It s o± desirable that an analyst should come to his i^;<l^^[y P^^^^^^J ™;ili but before adopting a conclusion as regards a water, the medical officer ^\ui allys d?:^^^^^^^^ obtain every item of information it^.at it is p^^^^^ to crPt—otlierwise he is sure to fall sooner or later into error, ilius, con sXnts mr S present in a deep-well water and have no particula^ s SancT whU^^^ a shallow-well water they would be, sufficient to Semn. At present we have Httle or - means o ^ ^Soll^l:^ W^t StS^ht.^ allowed 'TlSysis should always be as careful and --P^;,^^^^^^^^ a chemical analysis. ^^^^^ ^^^y quantities of I Ghlonne in Chlonde^ {.5 pdoO,000. Eain-water generaUy con- f •^oSToTf U de^P -Us' as a rule 5 parts per 100,000 ; tains 0 22 to 0 5 per iuu u , i ^^^^ ^.^rf^ce waters only springs generally 2 5 Pf^^^ P^^r.^ A 100,000. An increase m small quantities, usually about Pff ^Jf^^g^it^^earing strata, or ordinary drinking ^-^ter may be due to l^^^'l^^^f^^^^ sewage or other im^^^^^^^ ^nlSio dangerous conta'mination, innocent, but in tire ast m J ^^.^^^ ^^^^^^ ^^^^ ammonias, the o^^tlSeTattTan^^^^^ nitrogen acid, ^^fl^^^ take place wi^rout —— chlorides, Xrttaiis o^Te Sysis will show that this is not due to any recent contamination. clilorine is a reason for sus- the aVerage character of '/^l^if :„?'*r'i ,„Hds varie. Ter, greatly : % Solid., Tola and surface ™ter. contain very suppUes Liverpool, ^''j^^'^^]^^'^^^^^^^^^ ot\x^x than upland surface On the other hand, waters P^^^^^^^ i^y it down that the show much more than this. On the vhole^v^ J y ^^^^^ ^ purest upland surface .^Y^*^ .^^^^^^^^^^^^^ waters from deep 100,000, but that considerable latitude may oi. welis, chalk strata, and ^1^° j^^'®- ,100,000 ought to be volatile, Of the solids not more than al'out 5 per ^ ^^^ ^^^^^^^ ^ut or capable of being driven off by a rod heat, ilae](https://iiif.wellcomecollection.org/image/b2135764x_0112.jp2/full/800%2C/0/default.jpg)
