The microscopic organisms found in the blood of man and animals and their relation to disease. / By Timothy Richards Lewis.

  • Lewis, T. R. (Timothy Richards), 1841-1886.
Date:
1879
Catalogue details

Licence: Public Domain Mark

Credit: The microscopic organisms found in the blood of man and animals and their relation to disease. / By Timothy Richards Lewis. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

    101/112 (page 87)
    The following measurements may be useful to future observers :— Oral aperture to end of oesophagus .... inch, or •45 mm. Diameter of oral aperture ..... 1 3 0 0 0 1> }j i> •008 „ Width of extreme end (anterior) .... 1 5 1 7 }} )} 1) •047 „ Ditto anterior end at ' neck' . . . . 1 11 )> )} •045 „ Ditto opposite junction of intestine with oesophagus . 1 TT? }} }} » •112 „ Ditto about i inch from anterior end 1 15 3 )} }> i> •162 „ Width where packed with ova and embryos 1 10 0 )) }} )j •25 „ Width of uterine tube filled with ova .... 1 2 2 2 }> }> }} •112 „ Ditto alimentary tube 1 6 6 6 » >> )> •037 „ The ova do not possess any distinctly marked ' shell;' from the smallest to the largest nothing but a delicate pellicle can be The ova and embryos. t,. .it i • n i • n-j distmgmshed as enveloping the embryo m all its stages; consequently the form assumed by the ovum depends to a great extent on the degree of the surrounding pressm^e. In fig. 3 (Plate II) ova of various shapes are depicted (spherical, triangular, oval), and with a considerable latitude as to size. The average of six measm'ements of the less advanced kinds of ova, i. e., those in which the outline of the embryo was not distinctly evident = ttot ('018 mm.) by-goVTr (012 mm.) ; whilst the average measurements of three ova in which the embryos were visible = -g^-^ ('037 mm.) by ^ho (•030 mm.). When the latter, after having arrived at this stage of development, are examined during life, it is in many instances difficult to state whether they are to be considered as freed embryos or not, as the ' egg-shell' has become so ex- tremely attenuated and translucent as only with difficulty to be distinguished. By pressing the covering glass firmly the sac may often be ruptured. It, however, appears probable that, even when the embryo acquires worm-like appearances, the envelope is not lost in this species so long as it continues in the blood. It is of importance to bear this in mind, as, contrary to what is seen with regard to the nematoid hsematozoa of dogs, whi^h &eefmh^lstrfe^^oaet the cmbryos iu the blood of man are each contained in a translucent csecal tube. This tube is readily recognisable during life whenever the embryos can be properly observed in fresh clear serum, as also in spirit-preserved preparations. I possess at the present time specimens thus preserved of both species, one being contained in blood