Laboratory studies in tropical medicine / C.W. Daniels and H.B. Newham.
- Charles Wilberforce Daniels
- Date:
- 1911
Licence: Public Domain Mark
Credit: Laboratory studies in tropical medicine / C.W. Daniels and H.B. Newham. Source: Wellcome Collection.
Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.
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![45^ MORTALITY mentioned in the tabic, with the percentages. Ages cannot be ascertained with certainty, especially in coun- tries where the differences in season are not very marked. With children age has to he estimated from the size, teeth * and development. In adults knowledge of local history and notable events, the dates of which can be fixed, are of considerable value. Age periods of five years are usually taken, but it is of the utmost import- ance in malarial investigation to subdivide the first quinquennial period and further subdivide the first year into quarters. The first quarter should be subdivided into months. Malaria is rare till the end of the first month. As an age period the first ten years should never be taken as a whole, as such different results are obtained in a village, or in a series of observations, if a large proportion are, say, under four, or only a small proportion. Conclu- sions drawn from the incidence of malaria in the first ten years of life, taken as a whole, are often misleading. Mortality is best estimated at the rate of so many * Ages at which teeth are cut in Europeans. The differences in native races have not yet been worked out. Table kindly supplied to us by Mr. K. W. Goadby. Temporary Dentition. Central incisors 5th to 8th month. Lateral incisors 7th to 10th ,, First molars ... 12 th to 14th „ Canines 14th to 20th ., Second molars 20th to 30th ,, Permanent Dentition. Upper Jaw. Tower Jaw. Central incisors 77 years 7 years, Lateral incisors 8 11 - 8 „ Canines ... .., 11 )• ... 10 „ Premolar I. ] o ') 10 ,, Premolar II. ... ii 11 ... 11 „ Molar I ... b\ )j ••• 7 „ Molar 11 12 11 ... 12 „ Molar III ... 24 11 ... 24 „](https://iiif.wellcomecollection.org/image/b21224717_0486.jp2/full/800%2C/0/default.jpg)
