  In this paper, we report our discovery of blobs in the recurrent and
homologous jets that occurred at the western edge of NOAA active region 11259
on 2011 July 22. The jets were observed in the seven extreme-ultraviolet (EUV)
filters of the Atmospheric Imaging Assembly (AIA) instrument aboard the Solar
Dynamics Observatory (SDO). Using the base-difference images of the six filters
(94, 131, 171, 211, 193, and 335 {\AA}), we carried out the differential
emission measure (DEM) analyses to explore the thermodynamic evolutions of the
jets. The jets were accompanied by cool surges observed in the H$\alpha$ line
center of the ground-based telescope in the Big Bear Solar Observatory. The
jets that had lifetimes of 20$-$30 min recurred at the same place for three
times with interval of 40$-$45 min. Interestingly, each of the jets
intermittently experienced several upward eruptions at the speed of 120$-$450
km s$^{-1}$. After reaching the maximum heights, they returned back to the
solar surface, showing near-parabolic trajectories. The falling phases were
more evident in the low-$T$ filters than in the high-$T$ filters, indicating
that the jets experienced cooling after the onset of eruptions. We identified
bright and compact blobs in the jets during their rising phases. The
simultaneous presences of blobs in all the EUV filters were consistent with the
broad ranges of the DEM profiles of the blobs ($5.5\le \log T\le7.5$),
indicating their multi-thermal nature. The median temperatures of the blobs
were $\sim$2.3 MK. The blobs that were $\sim$3 Mm in diameter had lifetimes of
24$-$60 s. To our knowledge, this is the first report of blobs in coronal jets.
We propose that these blobs are plasmoids created by the magnetic reconnection
as a result of tearing-mode instability and ejected out along the jets.
